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Based on the theory of constructivism, this paper discusses in details the main factors of designing the learning platform of multimedia teaching resources, such as students, resources and teachers as well as the way of making full use of multimedia teaching resources.
The low-rank structure reverberation suppression algorithm is a better method to restrain the sea interface reverberation. But the data processing speed of the method is very slowly due to the complexity of singular value decomposition. It can not meet the real-time requirement in actual application. This article present a signal subspace fast approximation method based on unitary transformation which...
The inherent characteristic of ultrasonic and the application environment make ultrasonic image have some defects: image with speckle noise, edge blur and low contrast. In order to reduce the speckle noise and enhance the image characteristics, a speckle reduction and characteristic enhancement anisotropic diffusion algorithm is proposed based on the wavelet technology in this paper. The algorithm...
It's pointed out that teachers should pay great attention to cultivate primary engineered abilities of students in electronic technique experiments in this thesis. The writers have accomplished the global reform and optimization of a series of electronic technique experiment courses. Linking the experience of scientific research and engineering practice of the writers, the writers have designed the...
The principle and functions of the intelligent temperature control system based on Microcontroller AT89S51 are studied, and the temperature measurement unit consists of the 1-Wire bus digital temperature sensor DS18B20. The system can be expected to detect the preset temperature, to display time, to save and print monitoring data. An alarm will be given by system if the temperature exceeds the upper...
The sea interface reverberation model has been made based on the ray acoustic theory. A low-rank structure reverberation suppression algorithm has been presented based on the model. The detailed analysis and the final contrast simulation experiments show that the algorithm can be effectively suppress the shallow sea interface reverberation and solve the problem of weak target signal abstraction of...
VOD (video-on-demand) system must satisfy the user's demands of real-time VCR (video cassette recording) operations; this will bring an unbearable load to server if there are a large number of concurrent users. P2P (peer to peer) technology is the key solution to the problem. With the technology, multimedia data will be cached in peers and transmitted between peers, idle bandwidth between nodes will...
The characteristics of video data are very large amount and real time processing request, and H.264 is a high-complexity video compression standard, so a high speed arithmetic is needed for encrypting video data which is encoded by H.264 standard. But, for a high security video application, it's difficult to find an algorithm to meet the two requests: high security, high speed. A new stream cipher...
Period, relativity, distribution characteristics, computing time are usually used to evaluate the performance of pseudo-random number generators. Combination is a staple method to extend the period of random number generators, and the period will be longer if combined more generators. But, existing combined pseudo-random number generators will increase computing time when more random number sequences...
The thermal stability of the embankment, including the influence of the height and width of the embankment in high temperature permafrost regions was simulated and discussed respectively in terms of different natural geographic conditions for asphalt concrete pavements and cement concrete pavements. The aim is how to change the maximum thawed depth under the asphalt concrete pavements and cement concrete...
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